package com.prisetree.isv.request.validate;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {

	public XssHttpServletRequestWrapper(HttpServletRequest request) {
		super(request);
	}
	
	@Override
	public String[] getParameterValues(String parameter) {
      String[] values = super.getParameterValues(parameter);
      if (values==null)  {
    	  return null;
      }
      int count = values.length;
      String[] encodedValues = new String[count];
      for (int i = 0; i < count; i++) {
    	  encodedValues[i] = cleanXSS(values[i]);
      }
      return encodedValues;
    }
	
	@Override
    public String getParameter(String parameter) {
         String value = super.getParameter(parameter);
         if (value == null) {
        	 return null;
         }
         return cleanXSS(value);
    }
	
	@Override
    public String getHeader(String name) {
        String value = super.getHeader(name);
        if (value == null)
            return null;
        return cleanXSS(value);
    }

	private String cleanXSS(String value) {
        //You'll need to remove the spaces from the html entities below
		value = value.replaceAll("<", "&lt;").replaceAll(">", "&gt;");
		value = value.replaceAll("\\(", "&#40;").replaceAll("\\)", "&#41;");
		value = value.replaceAll("'", "&#39;");
		value = value.replaceAll("eval\\((.*)\\)", "");
		value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']", "\"\"");
		value = value.replaceAll("script", "");
		return value;
	}

}
